10 Most Messed Up Horror Movie Siblings

10. Katie And Kristi - Paranormal Activity

It’s easy to forget now, but when Paranormal Activity first landed in cinemas back in 2007, it was an absolute sensation. The lowkey approach to storytelling with well-timed jump scares resonated with audiences and spun an almighty profit - and so the sequels kept on comin’.

At the centre of the franchise - for the first three or so movies anyway (they admittedly blur together at some point) - are Katie and Kristi. Katie’s descent into possession is chronicled in the first film, with more backstory added to the sisters as the films go on.

As it turns out, Katie and Kristi were first introduced to all things demonic in their youth, and we get to watch their creepy childhood escapades with their imaginary pal Toby. Lucky us!

The second film in the franchise, however, reveals that it was Kristi who ultimately put Katie in the line of possession fire, transferring the demon’s attention from her own family onto Katie. Yes, it was to protect her own son, but damn, that’s seriously cold!

Technically Katie is still the more ‘evil’ of the two, given that she kills Micah (what a shame that was…) and abducts Hunter, but it wouldn’t have happened if Kristi hadn’t been so bloody cruel.